Among the following, the state functions are:

Internal energy

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Irreversible expansion work

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Reversible expansion work

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Molar enthalpy

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Solution

The correct options are
A Internal energy
D Molar enthalpy
State function is a quantity in thermodynamics, such as entropy or enthalpy, that has a unique value for each given state of a system.
(or)
A State Function is a thermodynamic quantity whose value depends only on the state at the moment, i. e., the temperature, pressure, volume, etc The value of a state function is independent of the history of the system's internal energy. Molar enthalpy and entropy are state quantities because they describe quantitatively an equilibrium state of a thermodynamic, irrespective of how the system arrived in that state.

Hence options A & D are correct.

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